Balancing device



W. M. DAVIDSON.

BALANCING DEVICE.

APPLICATION FILED NOV. l4 I918.

PutcntcdScpt, 2, 1919.

ATTOIUV'EY.

.Im J. W

N WN tary balance and balance of said rotor with UNITED STATES PATENT OFFICE.

WILLIAM M. DAVID SON, OF ST. LOUIS,MISSOURI, ASSIGN'OR T0 WILLIAMS PATENT GRUSHIER & PULVERIZER 00., OF ST. LOUIS, MISSOURI, A CORPORATION OF MIS- SOURI.

To all whom it'may concern:

Be it known that I, WILLIAM M. DAvIo- SON-{3. citizen of the United States, residing in city of St. Louis, State of Missouri, have inventedcertain new and useful Improvevnhents in Balancing Devices, of which the following is a specification.

Thisinvention relates to certain new and useful improvements in balancing devices, the same. being especially adapted to the rotor of reducing machine such as a grinder or pulverizer of refractory material that requires ahigh rotary speed of said motor and consequently as nearly perfect balance of the moving parts as it is practical to obtain.

The object of my invention is to provide means for obtaining the static balance, ro-

regard to any tendency to turn end for end in its bearings.

In the accompanying drawing on which like reference letters indicate corresponding parts, Figure 1 represents a vertical sectional view of a machine illustrating my invention,'said section being taken along the axis of the shaft; and Fig. 2 an end view of balancing means of my design applied to a an end disk on said shaft.

Theletter A designates a casing for a reducing mill of anyconvenient and suitable style, provided with a cover B and having bearings C in which are mounted the end journals D of a shaft provided with hammers E mounted on hammer rods F carried by end disks G, or otherwise adapted to support said hammers which are prefer- 'ably of the pivoted rotary type adapted to oscillate on said hammer rods. v

On opposite ends of said shaft are mounted a pulley H and a flywheel I as shown in Fig. 1. In my endeavor to obtain a true rotary balance for the rotor above described, I have carefully balanced each intermediate disk, pivoted hammer and hammer support contained in said rotor, so that when the rotor, is assembled the balance of the combined parts is approximately correct. I have found it necessary however, due to inaccurate workmanship and other causes, to provide other balancing means such as hereinillustrated. It will be seen from Fig. 2 that the hammer rods F are uniformly spaced circumferentially in said disks G-G, and it is therefore necessary BALANCING DEVICE.

to effect proper bal- Patented Sept. 2, 1919, Application filed November 14, 1918. Serial No. 252,579.

the cover is removed from said machine to give access to the rotor, the proper adjustment may be readily made, 1 1 The hubs g of said end disks are provided with tapped holes in each of which are in.-

serted a bolt "K radiating from the center of the shaft and located a suitabledistance away from the disk itself to allow of the turning of weights L, preferably cylindrical, and adapted to be fixed on said bolt K either by a set screw Z, or by providing such weights in duplicate whereby the may be jammed together like jam nuts w on properly adjusted on said bolt. The other or.

outer end of said bolt is preferably provided with a lug k that is fastened to the periphery of the disk by a screw. The bolt K is thus firmly supported in a radial position and the movable weight may be readily adi justed radially between the hammer rod nuts or any pair of them, and the said balancing weights may be secured or mounted adjustably between each pair and at difi'erent radial distance from the center to effect a proper balancing of the rotor as above While it is desirable to secure a rotary balance, it is also desirable to overcome the '90 described.

tendency of the shaft to turn end for end,

due to a difference of balance with regard to the bearings; that is to say, while the rotor may be in proper rotary balance, the rotor as a whole may tend to turn in a horizontal plane, so that if the bearings were flexible the shaft would Tbend one bearing in one direction and the other bearing in the opposite direction, or end for end as commonly stated. I have therefore provided a disk G opposite the disk G and similarly provided with balancing weights. either of the style described for disk G, or otherwise,such as by providing a wide disk in which are bored and threaded radial holes M in which are adjustably mounted threaded weights L having a square hole in the center, or other- Wise adapted a radial adjustments or the respective' weight.

In the preferred form of coverI have provided a safety recess 0, which is similarly formed in the body casing A, and in this recess the end disks are mounted so as to make the inner face of each disk flush with the inner face of said cover and easing, as shown in Fig. 1. If for any reason a movable weight or other part shouldbecome loose, it would not therefore find its way into the reducing chamber of the cover; and body cas- .turned up.

A similar arran ement of pockets such as shown in the disk is preferred for the flywheel, and in such pockets radially adjustable weights, either by threaded engagement or by loosely inserted Weights secured in proper adjusted position by set screws, may be employed. I

I claim: 1. The combination with a rotor shaft and end disks on said shaft each having a side hub, of a device of the character described comprising radial bolts threaded into the side hub of said disks, each of said bolts having a lug fastened to the periphery of said disk, and movable weights adjustably mounted on said bolts substantially as de scribed.

2. The combinationwith arotorhaving 'a I disk at each end, and a casing prov'idedwith a safety recess for each disk, of a balancing device comprising movable weights adjustably mounted on said disk and within said recess, and thereby prevented from entering said casing between the disks, in case of detachment.

3. The combination with a rotor and a casing having suitable bearings for thegshaft of said rotor, of end disks mounted on said shaft, and each provided with a balancing device of the characterdescribed, comprising movable, adjustable weights cooperating with each other to attain an end for end 'balanceof said shaft and rotor as well as a rotary balance thereof.

In testlmony whereof I have aflixed my signature.

WILLIAM M. DAVIDSON; 

